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Title: Network-Stabilized Bulk Heterojunction Organic Photovoltaics

Abstract

Bulk heterojunction organic photovoltaic (OPV) devices are multilayer organic devices that can be fabricated using low-cost and scalable solution processing methods, but current devices exhibit poor mechanical stability and degrade under deformation due to cracking and delamination. Recent approaches to improve mechanical durability involve modifying the side-chain or main-chain structures of conjugated polymers in the active layer, but in general it is difficult to simultaneously optimize electronic properties, morphology, and mechanical stability. Here, we present a general approach to improve the mechanical stability of bulk heterojunction active layers through incorporation of an internal elastic network. Network-stabilized bulk heterojunction OPVs are prepared using reactive small molecular additives that are rapidly cross-linked through thiol–ene coupling after processing the active layer. Thiol–ene reactions catalyzed by a base or initiated through short exposure to UV light produce insoluble, elastic thiol–ene networks in the active layer. We show through a combination of crack onset strain measurements, morphological analysis, and OPV device testing that network-stabilized OPVs with up to 20% thiol–ene network exhibit improved deformability with no loss in PCE, and we implement network-stabilized bulk heterojunction OPVs to produce stretchable photovoltaic devices. Here, this work represents a simple approach for improving the mechanical durability of bulkmore » heterojunction OPVs.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [1]; ORCiD logo [3]; ORCiD logo [1]
  1. Rice Univ., Houston, TX (United States)
  2. Rice Univ., Houston, TX (United States); Houston Community College, Houston, TX (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1489739
Report Number(s):
BNL-209754-2018-JAAM
Journal ID: ISSN 0897-4756
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 30; Journal Issue: 22; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; OPV

Citation Formats

Mok, Jorge Wu, Hu, Zhiqi, Sun, Changxu, Barth, Isaiah, Muñoz, Rodrigo, Jackson, Joshua, Terlier, Tanguy, Yager, Kevin G., and Verduzco, Rafael. Network-Stabilized Bulk Heterojunction Organic Photovoltaics. United States: N. p., 2018. Web. doi:10.1021/acs.chemmater.8b03791.
Mok, Jorge Wu, Hu, Zhiqi, Sun, Changxu, Barth, Isaiah, Muñoz, Rodrigo, Jackson, Joshua, Terlier, Tanguy, Yager, Kevin G., & Verduzco, Rafael. Network-Stabilized Bulk Heterojunction Organic Photovoltaics. United States. doi:10.1021/acs.chemmater.8b03791.
Mok, Jorge Wu, Hu, Zhiqi, Sun, Changxu, Barth, Isaiah, Muñoz, Rodrigo, Jackson, Joshua, Terlier, Tanguy, Yager, Kevin G., and Verduzco, Rafael. Fri . "Network-Stabilized Bulk Heterojunction Organic Photovoltaics". United States. doi:10.1021/acs.chemmater.8b03791.
@article{osti_1489739,
title = {Network-Stabilized Bulk Heterojunction Organic Photovoltaics},
author = {Mok, Jorge Wu and Hu, Zhiqi and Sun, Changxu and Barth, Isaiah and Muñoz, Rodrigo and Jackson, Joshua and Terlier, Tanguy and Yager, Kevin G. and Verduzco, Rafael},
abstractNote = {Bulk heterojunction organic photovoltaic (OPV) devices are multilayer organic devices that can be fabricated using low-cost and scalable solution processing methods, but current devices exhibit poor mechanical stability and degrade under deformation due to cracking and delamination. Recent approaches to improve mechanical durability involve modifying the side-chain or main-chain structures of conjugated polymers in the active layer, but in general it is difficult to simultaneously optimize electronic properties, morphology, and mechanical stability. Here, we present a general approach to improve the mechanical stability of bulk heterojunction active layers through incorporation of an internal elastic network. Network-stabilized bulk heterojunction OPVs are prepared using reactive small molecular additives that are rapidly cross-linked through thiol–ene coupling after processing the active layer. Thiol–ene reactions catalyzed by a base or initiated through short exposure to UV light produce insoluble, elastic thiol–ene networks in the active layer. We show through a combination of crack onset strain measurements, morphological analysis, and OPV device testing that network-stabilized OPVs with up to 20% thiol–ene network exhibit improved deformability with no loss in PCE, and we implement network-stabilized bulk heterojunction OPVs to produce stretchable photovoltaic devices. Here, this work represents a simple approach for improving the mechanical durability of bulk heterojunction OPVs.},
doi = {10.1021/acs.chemmater.8b03791},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 22,
volume = 30,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
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